In article , **THE-RFI-EMI-GUY**
wrote:

These usually have a circuit breaker/fuse that interrupts the power if
the temperature climbes too high. It is a safety device, usually spot
welded to the heating element. I would throw the unit away rather than
risk a fire by fixing it.

Al & T-R-E-G-

I had a water purifier that had a thermal fuse open up. Although these
fuses (also called a thermal cut-off) are meant to prevent a fire, they
sometimes open due to age. As long as you can determine their rated
temperature, it should be safe to replace them. Using a magnifying glass,
look for a rating printed on the body. It might be in either Centigrade
or Farenheit.

I found a replacement at Radio Shack, where they had two or three
different temperatures. They are also available from NTE.

Since heat will cause them to open, you can't solder them easily. The
environment where they exist is also bad for solder connections.
Therefore crimping may be the best option unless you have spot-welding
equipment. Some come with small brass cylinders or ferrules that can be
slipped over the wires for crimping. Otherwise you might use the barrels
from a regular crimp terminal with the terminal part clipped off.

Fred